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  1. Trestala

    TEMA DEU/CEU Heat Exchanger - Connection Challenges & Analysis

    It is advisable to convert the TEMA type to NEU, as designing a flange connection for CEU/DEU types can be challenging, especially considering the need for mechanical cleaning. The shell side fluid can be switched to the tube side, and there are contractors capable of performing mechanical...
  2. Trestala

    TEMA DEU/CEU Heat Exchanger - Connection Challenges & Analysis

    Try considering NEU type heat exchanger since you're using corrosion resistant alloy in the tubes and weld overlay on the base metal anyway. That would address a lot of your design issues. Do you need mechanical cleaning for the shell side? With that pressure as well, it would be difficult...
  3. Trestala

    Vessel for Hydrotest over MAWP

    What is the vessel's MAP (not MAWP) though at 60°F? (uncorroded and ambient temperature).
  4. Trestala

    Shell forming method with low out of roundness for thin shell

    Adding stiffener rings or stays is not an option?
  5. Trestala

    nozzle-head PWHT

    Just ignore r6155. Apparently, he can't visualize your nozzle based on your description which is a very simple and common nozzle configuration. @Vessel-SA, if you read ASME Companion Guide to BPVC, they explain the requirement for preheat and PWHT is a function of the thickness of the part...
  6. Trestala

    ASME VIII-1 Nozzle Spacing Clash

    You can modify the limits of reinforcement in PVElite. However, if you have that kind of spacing, you'll still have to consider multiple openings and overlapping local stress due to piping external loads if applicable. You can increase the thickness of the shell course where the nozzle is...
  7. Trestala

    Reducing flange analysis using FEA or Div 1

    Pointless responses.
  8. Trestala

    Bolts and Nuts for High-Temperature Applications – Ambiguities in European Standards

    I'm fairly certain majority of Owners/Contractors exclude austenitic SS bolts mainly due to Chloride SCC, galling, and it being an intermediate/low strength bolting for pressure retaining components such as flanges. If you're near the shore or the bolts being exposed to rainwater, that can cause...
  9. Trestala

    Deaerator Inspection Frequency

    See API RP 581 and 580
  10. Trestala

    Wer H2S at elevated temperatures debate

    The total sulfide species content in aqueous phase will need to be calculated to determine if you'll meet the threshold (see NACE MR0175 Part 2 Annex C).
  11. Trestala

    ASME Section VIII Div.1 formed head straight flange (skirt) design for external loads

    Commercial softwares such as Compress and PVElite already does this for the straight flange of heads.
  12. Trestala

    Piping wall thickness calculation during hydrotest condition

    The purpose of hydrostatic test is to verify the strength of your piping if it can handle the design pressure safely by using a pressure above it.
  13. Trestala

    Reducer - FEA analysis

    Or why not design it in ASME BPVC, Sec. VIII, Div. 1?
  14. Trestala

    Oil flange redesign

    I doubt anyone would adopt changing the dimensions of standard WN flanges (ASME B16.5 and B16.47) and also just minor adjustments on the hub dimensions.
  15. Trestala

    Ring Type Flange from Rolled Strip

    It is implied already in other parts of the Code considering lamination concerns on plates. It is not due to the grain structure. Based on engineering judgment, Option 1 should be avoided. Red line is lamination :
  16. Trestala

    Ring Type Flange from Rolled Strip

    The reasoning for Appendix 2-2(d)(1) I believe is more on avoiding opening up the laminations as a result of plate manufacturing (this is discussed in ASME BPVC Companion Guide). It is not really about the grain direction (metallic grain structure) as it is kind of scattered and random...
  17. Trestala

    edge preparation

    Some specifications can still allow thermal cutting for Q&T material if you apply preheating during cutting operation and you perform subsequent heat treatment.
  18. Trestala

    Common Venting CAT II: Flue Sizing

  19. Trestala

    NCSP-2015 to ASCE 7

    NSCP 2015 is still based on UBC 1997. They might have quite different load combinations as well.
  20. Trestala

    Forming Strains under ASME VIII-1 vs ASME VIII-2

    Elliptical ≠ Ellipsoidal Also, the interpretation you quoted acknowledges there is a knuckle on an ellipsoidal head. You haven't answered where it is required to measure actual strains even. In addition, if you're dishing and spinning a head, you'll need to have a crown radius and a knuckle...

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